Gastric sleeve (sleeve gastrectomy) is a bariatric surgery method generally considered for people with a body mass index (BMI) of 40 or higher, or a BMI between 35 and 40 who also have an accompanying condition such as diabetes or hypertension. The answer to "what weight is required?" depends not on weight alone, but on your BMI value—which reflects your weight relative to your height—and on your overall health. In this article, we explain the eligibility criteria and the evaluation process.
Why is eligibility based on BMI rather than weight?
Weight on its own does not show whether a person is suitable for surgery, because the same weight means something different at different heights. For this reason, international guidelines rely on body mass index (BMI). BMI is calculated by dividing a person's weight in kilograms by the square of their height in metres (kg/m²). To find out your own value, you can use our BMI calculator.
General eligibility criteria for gastric sleeve surgery
| BMI value | General assessment |
|---|---|
| 40 and above | May be considered for surgery regardless of any accompanying condition. |
| 35 – 39.9 | May be considered if there is an accompanying condition such as diabetes, hypertension, or sleep apnoea. |
| 30 – 34.9 | May be considered in selected cases and in metabolic conditions that cannot be brought under control; the decision rests with the physician. |
| Below 30 | Surgery is generally not recommended; lifestyle and medical approaches take priority. |
These thresholds are a general framework. Final eligibility is determined by current guidelines (the ASMBS/IFSO 2022 joint statement), the person's medical history, and a physician's examination.
Factors evaluated beyond BMI
- Accompanying conditions: diabetes, hypertension, sleep apnoea, joint problems.
- Previous weight-loss efforts: the outcome of diet and lifestyle changes.
- Overall health and fitness for surgery: cardiac, pulmonary, and anaesthetic evaluation.
- Expectations and commitment to the process: willingness to follow the post-operative nutrition plan.
Is there an age limit?
Bariatric surgery is generally considered in adult patients. In very young or older age groups, the decision is made individually by the physician, taking into account the person's overall health and the likely balance of benefit and risk. Rather than a fixed upper age limit, what matters is the person's suitability for surgery.
Who may not be suitable?
Some situations that can prevent surgery include uncontrolled serious health problems, cases where it is anticipated that the post-operative nutrition plan cannot be followed, and certain psychological or medical conditions. This assessment can only be made through examination.
How does the evaluation process work?
- A physician's examination, along with assessment of BMI and accompanying conditions.
- Necessary tests: blood tests, endoscopy, and any required consultations.
- The eligibility decision and a personalised plan for the process.
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